Ara es mostren els items 2-21 de 46

    • Barocaloric response of plastic crystal 2-methyl-2-nitro-1-propanol across and far from the solid-solid phase transition 

      Salvatori, Alejandro; Barrio Casado, María del; Negrier, Philippe; Massip, Stephane; Romanini, Michela; Aznar Luque, Araceli; Lloveras Muntané, Pol Marcel; Tamarit Mur, José Luis (Institute of Physics (IOP), 2023-10-25)
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      Accés obert
      Plastic crystals have emerged as benchmark barocaloric (BC) materials for potential solid-state cooling and heating applications due to huge isothermal entropy changes and adiabatic temperature changes driven by pressure. ...
    • C60 solvate with (1,1,2)-trichloroethane: dynamic statistical disorder and mixed conformation 

      Mitsari, Efstratia; Romanini, Michela; Qureshi, Navid; Tamarit Mur, José Luis; Barrio Casado, María del; Macovez, Roberto (2016-05-27)
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      We present a full characterization of the orientationally disordered cocrystal of C-60 with (1,1,2)-triChloroethane (C2H3Cl3), by means of X-ray diffraction, Raman spectroscopy, and broadband dielectric spectroscopy. Our ...
    • Collective relaxation dynamics and crystallization kinetics of the amorphous Biclotymol antiseptic 

      Tripathi, Pragya; Romanini, Michela; Tamarit Mur, José Luis; Macovez, Roberto (2015-11-10)
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      Accés obert
      We employ dielectric spectroscopy to monitor the relaxation dynamics and crystallization kinetics of the Biclotymol antiseptic in its amorphous phase. The glass transition temperature of the material as determined by ...
    • Comparative physical study of three pharmaceutically active benzodiazepine derivatives: crystalline versus amorphous state and crystallization tendency 

      Valenti, Sofia; Barrio Casado, María del; Negrier, Philippe; Romanini, Michela; Macovez, Roberto; Tamarit Mur, José Luis (American Chemical Society, 2021-01-01)
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      Chemical derivatization and amorphization are two possible strategies to improve the solubility and bioavailability of drugs, which is a key issue for the pharmaceutical industry. In this contribution, we explore whether ...
    • Dielectric spectroscopy studies of conformational relaxation dynamics in molecular glass-forming liquids 

      Romanini, Michela; Macovez, Roberto; Valenti, Sofia; Noor, Wahi; Tamarit Mur, José Luis (Multidisciplinary Digital Publishing Institute (MDPI), 2023-12-06)
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      We review experimental results obtained with broadband dielectric spectroscopy concerning the relaxation times and activation energies of intramolecular conformational relaxation processes in small-molecule glass-formers. ...
    • Double primary relaxation in a highly anisotropic orientational glass-former with low-dimensional disorder 

      Romanini, Michela; Barrio Casado, María del; Capaccioli, Simon; Ruíz Martín, María Dolores; Macovez, Roberto; Tamarit Mur, José Luis (2016-04-26)
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      The freezing of the cooperative reorientational motions in orientationally disordered (OD) molecular crystals marks the so-called \glassy" transition, which may be considered a lower-dimensional version of the structural ...
    • Drug-biopolymer dispersions: morphology-and temperature-dependent (anti)plasticizer effect of the drug and component-specific Johari–Goldstein relaxations 

      Valenti, Sofia; Valle Mendoza, Luis Javier del; Romanini, Michela; Mitjana Rusiñol, Meritxell; Puiggalí Bellalta, Jordi; Tamarit Mur, José Luis; Macovez, Roberto (2022-03-01)
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      Amorphous molecule-macromolecule mixtures are ubiquitous in polymer technology and are one of the most studied routes for the development of amorphous drug formulations. For these applications it is crucial to understand ...
    • Emergence of glassy-like dynamics in an orientationally ordered phase 

      Romanini, Michela; Negrier, Philippe; Tamarit Mur, José Luis; Capaccioli, Simon; Barrio Casado, María del; Pardo Soto, Luis Carlos; Mondieig, Denise (2012-04-04)
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      Accés obert
      The dynamics of a simple rigid pseudoglobular molecule (2-adamantanone) has been studied by means of dielectric spectroscopy and examined under the constraints imposed by the space group of the crystal structure determined ...
    • Enhancement of the physical and chemical stability of amorphous drug-polymer mixtures via cryogenic comilling 

      Romanini, Michela; Lorente, Marta; Schammé, Benjamin; Delbreilh, Laurent; Dupray, Valérie; Coquerel, Gerard; Tamarit Mur, José Luis; Macovez, Roberto (American Chemical Society (ACS), 2018-11-27)
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      Amorphous dispersions of the Biclotymol antiseptic are obtained in polyvinylpyrrolidone (PVP), for different drug loadings, by comilling at temperatures below the glass transition of both components. Characterization of ...
    • Eutectic mixture formation and relaxation dynamics of coamorphous mixtures of two benzodiazepine drugs 

      Valenti, Sofia; Cazorla Silva, Claudio; Romanini, Michela; Tamarit Mur, José Luis; Macovez, Roberto (Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-01)
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      Accés obert
      The formation of coamorphous mixtures of pharmaceuticals is an interesting strategy to improve the solubility and bioavailability of drugs, while at the same time enhancing the kinetic stability of the resulting binary ...
    • Genuine antiplasticizing effect of water on a glass-former drug 

      Ruiz Tabbia, Guadalupe Natalia; Romanini, Michela; Hauptmann, Astrid; Loerting, Thomas; Shalaev, Evgenyi; Tamarit Mur, José Luis; Pardo Soto, Luis Carlos; Macovez, Roberto (Macmillan Publishers, 2017-08-07)
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      Water is the most important plasticizer of biological and organic hydrophilic materials, which generally exhibit enhanced mechanical softness and molecular mobility upon hydration. The enhancement of the molecular dynamics ...
    • Giant and reversible barocaloric effect in trinuclear spin-crossover complex Fe3(bntrz)6(tcnset)6 

      Romanini, Michela; Lloveras Muntané, Pol Marcel; Barrio Casado, María del; Aznar Luque, Araceli; Gracia Condal, Adrià; Emre, Baris; Tamarit Mur, José Luis; Planes Vila, Antoni; Manosa, L (2021-03)
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      Accés obert
      A giant barocaloric effect (BCE) in a molecular material Fe3(bntrz)6(tcnset)6 (FBT) is reported, where bntrz = 4-(benzyl)-1,2,4-triazole and tcnset = 1,1,3,3-tetracyano-2-thioethylepropenide. The crystal structure of FBT ...
    • Giant barocaloric effects over a wide temperature range in the superionic conductor AgI 

      Aznar Luque, Araceli; LLoveras, Pol; Romanini, Michela; Barrio Casado, María del; Tamarit Mur, José Luis; Cazorla Silva, Claudio; Errandonea Ponce, Daniel; Mathur, N.D.; Planes, Antoni; Moya, Xavier; Mañosa Carrera, Lluis (2017-11-29)
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      Current interest in barocaloric effects has been stimulated by the discovery that these pressure-driven thermal changes can be giant near ferroic phase transitions in materials that display magnetic or electrical order. ...
    • Glass transition, crystallization kinetics, and inter-conformer relaxation dynamics of amorphous mitotane and related compounds 

      Romanini, Michela; Pérez Valmaseda, Alex; Macovez, Roberto (Elsevier, 2022-12-15)
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      We employ differential scanning calorimetry, broadband dielectric spectroscopy and optical microscopy to investigate the glass transition, molecular relaxation dynamics, and isothermal recrystallization kinetics of amorphous ...
    • Heat sink avalanche dynamics in elastocaloric Cu-Al-Ni single crystal detected by infrared calorimetry and Gaussian filtering 

      Capellera, Guillem; Lanniciello, Lucia; Romanini, Michela; Vives Santa-Eulàlia, Eduard (2021-10-11)
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      The physics behind the cooling process occurring in an elastocaloric Cu–Al–Ni wire during the martensite to austenite transition after stress release is studied. A previous experiment using infrared imaging determined the ...
    • Hopping conductivity and polarization effects in a fullerene derivative salt 

      Macovez, Roberto; Zachariah, Manesh; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Tamarit Mur, José Luis (2014-06-12)
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      Accés restringit per política de l'editorial
      Impedance spectroscopy is employed to probe the frequency-dependent conductivity and dielectric response of the C60O24Na 24 fulleride. The conduction properties of this organic material match the so-called universal behavior ...
    • Implanted muon spin spectroscopy on 2-O-adamantane: a model system that mimics the liquid 

      Romanini, Michela; Tamarit Mur, José Luis; Pardo Soto, Luis Carlos; Bermejo, F. J.; Fernandez Perea, Ricardo; Pratt, F. L. (2017-03-01)
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      The transition taking place between two metastable phases in 2-O-adamantane, namely the [Formula: see text] cubic, rotator phase and the lower temperature P21/c, Z  =  4 substitutionally disordered crystal is studied by ...
    • Inter-enantiomer conversion dynamics and Johari–Goldstein relaxation of benzophenones 

      Romanini, Michela; Macovez, Roberto; Tamarit Mur, José Luis (Nature, 2021-10-12)
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      We employ temperature- and pressure-dependent dielectric spectroscopy, as well as differential scanning calorimetry, to characterize benzophenone and the singly-substituted ortho-bromobenzophenone derivative in the liquid ...
    • Large barocaloric effects in two novel ferroelectric molecular plastic crystals 

      Salvatori, Alejandro; Aguilà Aviles, David; Aromí, Guillem; Mañosa Carrera, Lluis; Planes Vila, Antoni; Lloveras Muntané, Pol Marcel; Pardo Soto, Luis Carlos; Appel, Markus; Nataf, Guillaume F.; Giovannelli, Fabien; Barrio Casado, María del; Tamarit Mur, José Luis; Romanini, Michela (Royal Society of Chemistry (RSC), 2023-05-19)
      Article
      Accés restringit per política de l'editorial
      Materials undergoing pressure-driven solid–solid phase transformations can be a valuable alternative for eco-friendly refrigeration, heat pumping and waste heat recovery based on the barocaloric effect. Ferroelectric ...
    • Mixtures of m-fluoroaniline with apolar aromatic molecules: Phase behaviour, suppression of H-bonded clusters, and local H-bond relaxation dynamics 

      Romanini, Michela; Barrio Casado, María del; Macovez, Roberto; Capaccioli, Simon; Tamarit Mur, José Luis (2019-12-15)
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      Accés obert
      We employ differential scanning calorimetry, IR spectroscopy, X-ray powder diffraction and dielectric spectroscopy to characterize binary mixtures of m-fluoroaniline (mFA), a rigid-molecule glass former, with two ...